<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

    </style>
</head>

<body>

</body>
<script>
    //声明一个对象
    const banji = {
        name: "nmsl",
        stus: [
            "T", "M", "L", "G"
        ],
        [Symbol.iterator]() {
            //索引变量
            let index = 0;
            let _this = this;
            return {
                next: function () {
                    if (index < _this.stus.length) {
                        const result = {
                            value: _this.stus[index],
                            done: false
                        }
                        ///下标自增
                        index++
                        //返回结果
                        return result;
                    } else {
                        return {
                            value: undefined,
                            done: true
                        }
                    }

                }
            }
        }
    }
    for (let v of banji) {
        console.log(v)
    }
</script>

</html>